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            <td width="35%" class="headerValue"><a href="../../index.html">top level</a> - <a href="index.html">src/encoding</a> - mqtt_client_mqtt_encoding.dart<span style="font-size: 80%;"> (source / <a href="mqtt_client_mqtt_encoding.dart.func.html">functions</a>)</span></td>
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            <td class="headerItem">Test:</td>
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            <td class="headerItem">Lines:</td>
            <td class="headerCovTableEntry">14</td>
            <td class="headerCovTableEntry">14</td>
            <td class="headerCovTableEntryHi">100.0 %</td>
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            <td class="headerItem">Date:</td>
            <td class="headerValue">2017-10-09</td>
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            <td class="headerItem">Functions:</td>
            <td class="headerCovTableEntry">0</td>
            <td class="headerCovTableEntry">0</td>
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<pre class="sourceHeading">          Line data    Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum">       1 </span>            : /*</a>
<span class="lineNum">       2 </span>            :  * Package : mqtt_client
<span class="lineNum">       3 </span>            :  * Author : S. Hamblett &lt;steve.hamblett@linux.com&gt;
<span class="lineNum">       4 </span>            :  * Date   : 31/05/2017
<span class="lineNum">       5 </span>            :  * Copyright :  S.Hamblett
<span class="lineNum">       6 </span>            :  */
<span class="lineNum">       7 </span>            : 
<span class="lineNum">       8 </span>            : part of mqtt_client;
<span class="lineNum">       9 </span>            : 
<span class="lineNum">      10 </span>            : /// Encoding implementation that can encode and decode strings in the MQTT string format.
<span class="lineNum">      11 </span>            : ///
<span class="lineNum">      12 </span>            : /// The MQTT string format is simply a pascal string with ANSI character encoding. The first 2 bytes define
<span class="lineNum">      13 </span>            : /// the length of the string, and they are followed by the string itself.
<span class="lineNum">      14 </span>            : class MqttEncoding extends Utf8Codec {
<span class="lineNum">      15 </span>            :   /// Encodes all the characters in the specified string into a sequence of bytes.
<span class="lineNum">      16 </span>            :   typed.Uint8Buffer getBytes(String s) {
<span class="lineNum">      17 </span><span class="lineCov">          5 :     _validateString(s);</span>
<span class="lineNum">      18 </span><span class="lineCov">          5 :     final typed.Uint8Buffer stringBytes = new typed.Uint8Buffer();</span>
<span class="lineNum">      19 </span><span class="lineCov">         15 :     stringBytes.add(s.length &gt;&gt; 8);</span>
<span class="lineNum">      20 </span><span class="lineCov">         15 :     stringBytes.add(s.length &amp; 0xFF);</span>
<span class="lineNum">      21 </span><span class="lineCov">         15 :     stringBytes.addAll(encoder.convert(s));</span>
<span class="lineNum">      22 </span>            :     return stringBytes;
<span class="lineNum">      23 </span>            :   }
<span class="lineNum">      24 </span>            : 
<span class="lineNum">      25 </span>            :   /// Decodes the bytes in the specified byte array into a string.
<span class="lineNum">      26 </span>            :   String getString(typed.Uint8Buffer bytes) {
<span class="lineNum">      27 </span><span class="lineCov">         15 :     return decoder.convert(bytes.toList());</span>
<span class="lineNum">      28 </span>            :   }
<span class="lineNum">      29 </span>            : 
<span class="lineNum">      30 </span>            :   ///  When overridden in a derived class, calculates the number of characters produced by decoding all the bytes in the specified byte array.
<span class="lineNum">      31 </span>            :   int getCharCount(typed.Uint8Buffer bytes) {
<span class="lineNum">      32 </span><span class="lineCov">         10 :     if (bytes.length &lt; 2) {</span>
<span class="lineNum">      33 </span><span class="lineCov">          1 :       throw new Exception(</span>
<span class="lineNum">      34 </span>            :           &quot;mqtt_client::MQTTEncoding: Length byte array must comprise 2 bytes&quot;);
<span class="lineNum">      35 </span>            :     }
<span class="lineNum">      36 </span><span class="lineCov">         20 :     return ((bytes[0] &lt;&lt; 8) + bytes[1]);</span>
<span class="lineNum">      37 </span>            :   }
<span class="lineNum">      38 </span>            : 
<span class="lineNum">      39 </span>            :   /// Calculates the number of bytes produced by encoding the characters in the specified.
<span class="lineNum">      40 </span>            :   int getByteCount(String chars) {
<span class="lineNum">      41 </span><span class="lineCov">          5 :     _validateString(chars);</span>
<span class="lineNum">      42 </span><span class="lineCov">         10 :     return getBytes(chars).length;</span>
<span class="lineNum">      43 </span>            :   }
<span class="lineNum">      44 </span>            : 
<span class="lineNum">      45 </span>            :   /// Validates the string to ensure it doesn't contain any characters invalid within the Mqtt string format.
<span class="lineNum">      46 </span>            :   static void _validateString(String s) {
<span class="lineNum">      47 </span><span class="lineCov">         15 :     for (int i = 0; i &lt; s.length; i++) {</span>
<span class="lineNum">      48 </span><span class="lineCov">         10 :       if (s.codeUnitAt(i) &gt; 0x7F) {</span>
<span class="lineNum">      49 </span><span class="lineCov">          1 :         throw new Exception(</span>
<span class="lineNum">      50 </span>            :             &quot;mqtt_client::MQTTEncoding: The input string has extended &quot;
<span class="lineNum">      51 </span>            :                 &quot;UTF characters, which are not supported&quot;);
<span class="lineNum">      52 </span>            :       }
<span class="lineNum">      53 </span>            :     }
<span class="lineNum">      54 </span>            :   }
<span class="lineNum">      55 </span>            : }
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